Valve-gear for steam-engines.



PATENTED MAR. 10, 1908. A. D. BAKER. VALVE GEAR FOR STEAM ENGINES.

, APPLICATION FILED SEPT. 7, 1905.

'25 direction. I

of the devices and arrangement of partshereruns TPE'NT O I E VALvE-GEAR''ron' srnnmnnejmns.

Specification of Letters Patent: I

Patented'March 10,1908;

Application filed'sep'tember 7,- 1965, Serial No. 277,307.

To all whom it may concern:

Be it known that I, ABNER DJBA'KER, a citizen of the United States,residing .at 'Swanton, in the county of Fulton and. State 5 of Ohio,have inventedcer'tain new and use-' and is designed to furnish means ofeconrate ad ustment by means of which wear may be compensated for and bymeans of which uniform lead and uniform ort open-. ings at each end ofthe valve-stroke maybe obtained when the engine is-running in either 1.attain these objects by means 'inafter described and shown, andillustrated in the accompanying drawings in which- Figure 1 is a sideelevation of a portion 01 my engine; Fig. 2 a like view, on an enlargedscale, showing a modification of the bell-crank lever and the newad'usting devices hereinafter referred to, an Fig. 3' anend-elevation ofthe rock-arm hereinafter referred to with the adjustable box hereinafterreferred to, shown insection. 1

Like letters of reference indicate like parts throughout the drawings.

In the drawings, a is the crank-shaft of the;

4 engine. On this shaft is an eccentric b, its strap c b'ein connected.with one end of an eccentric roc (Z, the other end of the eccentric rodbeing bifurcated as at d. I

c is a short shaft or journal-pin u on which the two ends (1 of theeccentric r0 are journaled. On this same pin 6, between the parts (1, isj ournaled the lower end of a hanger or link f. The upper endofthls linkis journaled, as at, between the upper ends of two rock-arms g, upon ashort shaft or journal-pin h, secured at its ends in the upper ends ofthe rock-arms.

' is jvurnaled at its lower end in a pedestalor bracket *5 and the otherarrn is journaled at it s lower end u Jon the frame of the engine. 7

A: is a short aft or journal-pin the ends of One of the rock-arms 'whichare-mounted in the two arms of the eccentric-rod.

1 is a link 'one- 'end of which-is 'journaied upon and engaged 'withthe'pin k, the'other :end being pivotally en aged, as"at'm,""-with onearm of a bell-crank ever 1, journaledpasat 0,upon' bracket p secured tothe frameiof the engine. The extremity of the other arm of thebell-crankis pivotally connected with and 'actuates theengines'valve-rod-q.

yr isa quadrant and s is a reversing -lever,

having a. pawl 15 ada ted to enga e "the toothed sector it". The ever ispivotal y'- connected with one'end of rod v the other-end of the rodbeing pivotally connected, as at with the rock-arm g.

The construction of myengine, thus "far described, is thesame'as'in. thepatent above referred to tindthe operation ofthis construction, therefully described need not be here further elaborated.

Upon the middle bearing portion-of the shaft or pin e is formed,preferably integral therewith, an eccentric g-udgeon c The projectingend of the shaft is provided with means for. turning the 'shaft,-in this-instance a transverse hole through the end of the shaft for thereception of an instrument by means of which the shaft with itseccentric may be turned, thus changing the relation of-the link orhanger f to the eccentric rod.-' e is a loose split sleeve or bushingwhich forms a bearing for the eccentric e.

The sleeve is held fixed and its wear may-be taken up'by the set-screw escrews which secure the'shaft e in adjusted position and "againstaxialmovement. -To I permit the axial adjustment of the shaft e v theset-screws 6 must first be loosened. The adjustment here described is"designed to take up wear and to aid in obtaining exactly the properdistance of the hearing from the center of the eccentric and toobtainand 4 maintain a uniform lead. Theshaft 1c isin like manner providedwith an. eccentric gudgeon is, provided with suitable means for turningthe shaft, having also a split sleeve or bushing It. and a set-screw k kkare set-screws'for securing the shaft .70 in'the desired axialadjustment. By the axial movement of the shaft is, with its eccen-'tric, the relation of the lower efid of the link-Z I to. theeccentric-rod may be essay adjusted thus governing exactly thethrow' ofthe valve and the port-openings. By means of these two adjustments theport-openings at each valve-strokes were not uniform end of thevalve-stroke, when the engine is ng in either direction, may be made in?n. justahle, as at I, as heretofore, but this ad justment of the upperpart throws the lower end of the link out of time and rel ation, hencethe necessity "for the adjustment of the posi- 'tion ofthe lower end ofthe link in relation to the eccentricnod.

In the construction shown in the potent shove referred to it was foundthat by reason of the hell-crank arms being disposed at a i, In avalve-gear for controlling the admission and exhaust valve of a steamengine, en eccentric and eccentric-rod, a valve-rod, connectionsintermediate the eccentric-rod the valve-rod, u rock-arm, a link orhenger pivotslly connected with the rockaim, pivots! connections betweenthe link end theeccentridrod, means in said pivotal connectionsconsisting of an eccentric for the sdjustnient of the link with theeccentric i d, end means for controlling the position (M. the rock arm.

' Q in a valve-gear for steam engines, an .c and eccentric-rod, avalve-rod for connection with the valve, a bell-crank connected withthevalve-rod, a link pivotally connected at one end with the bell-crank,a el connection between the other end of em. The upper end of the link Iis adconsisting of an eccentric for the adjustment of said latterpivotal connection.

3. In a valve-gear for steam engines, an eccentric and eccentric-rod, avalve-rod for connection with the valve, a bell-crank one end of whichis connected with the valve-rod, a link pivotally connected,-at one end,with the other arm of the bell-crank and pivotally connected, at itsother end, with the eccentric-rod, means for the adjustment of said twopivotal connections of said link, a rockarm, a link pivoted to therock-arm and to the eccentric-rod, an eccentric for adjusting the saidlatter pivot, and means for controlling the'position of the rock-arm.

4. In a. valve-gcar for steam engines, an eccentric and eccentric-Tod, avalve-rod for connection with. the valve, devices for controlling thevalve-rod independently of the motion of the engine, pivotal connectionsin said. devices and means for adjusting one or more of said pivotalconnections eccentrically, said means of adjustment comprising a shaftadapted for manual rotation and which engages theoverlapping endsof twomembers, an eccentric on said shaft and in engagement with one ofsuch'members, and means for securing the shaft against axial movei'nent.

5. In valve-gear for steam engines, an eccentric and eccentric-rod, avalve-rod for connection with the valve, a bell-crank connected with thevalve-rod having its two arms relatively disposed at an angle greaterthan a right an le, a link pivotally connected at one end witl thebell-crank, and pivotal connection between the other end of the link andthe eccentric-rod, and means consisting of an eccentric for theadjustment of said letter pivotal connection.

In testimony whereof I afiix my signature in presence of two witnesses.

ABNER D. BAKER.

Witnesses: v

M. C. CAMPBELL, FRANK BERKEBILE.

